Analysis of Vehicle’s P/T Sensitivity Based on Transfer Path Method
Author(s): HOU Chen-yuan, WANG Xiao-hu, WANG Liang, LI Jian-hua
Pages: 116-120,125
Year: 2015 Issue: 5
Journal: Noise and Vibration Control
Keyword: acoustics; finite element method; fluid-structure coupling; P/T acoustic sensitivity; mount dynamic-stiffness;
Abstract: It is important to accurately calculate the sound pressure in vehicles induced by the powertrain torque excitation for advanced vehicle development. In this paper, a detailed finite element model for whole vehicle structure including the fluid in the acoustic cavity was established. The fluid-structure coupled finite element equations were formulated. The model was validated with the method of modal assurance criterion. Based on the model, the acoustic sensitivity defined by sound pressure over torque, P/T, was calculated. The test was carried out under the same boundary condition. It is shown that the simulation result has a good agreement with the test result in 30 Hz-100 Hz frequency range, while in 10 Hz-30 Hz frequency range the simulation result of P/T is lower than that of the test. The simulation and tests of the mount isolation and powertrain rigid-body modals were completed and the results were analyzed. It was found that the mount low-frequency dynamic-stiffness characteristics have large influence on P/T. When the mount dynamic-stiffness value increases, the P/T results of simulation and tests have a good consistency in whole frequency band of 0-100 Hz.
Pages: 116-120,125
Year: 2015 Issue: 5
Journal: Noise and Vibration Control
Keyword: acoustics; finite element method; fluid-structure coupling; P/T acoustic sensitivity; mount dynamic-stiffness;
Abstract: It is important to accurately calculate the sound pressure in vehicles induced by the powertrain torque excitation for advanced vehicle development. In this paper, a detailed finite element model for whole vehicle structure including the fluid in the acoustic cavity was established. The fluid-structure coupled finite element equations were formulated. The model was validated with the method of modal assurance criterion. Based on the model, the acoustic sensitivity defined by sound pressure over torque, P/T, was calculated. The test was carried out under the same boundary condition. It is shown that the simulation result has a good agreement with the test result in 30 Hz-100 Hz frequency range, while in 10 Hz-30 Hz frequency range the simulation result of P/T is lower than that of the test. The simulation and tests of the mount isolation and powertrain rigid-body modals were completed and the results were analyzed. It was found that the mount low-frequency dynamic-stiffness characteristics have large influence on P/T. When the mount dynamic-stiffness value increases, the P/T results of simulation and tests have a good consistency in whole frequency band of 0-100 Hz.
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